Malicious PDF — malware analysis report

Static analysis result for SHA-256 4587aebe8b271cff…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 22:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d704fd90f01fcd9e91851d266af09a2 SHA-1: e2df5679fae6e9f3d4c22dfbce9958501f22a377 SHA-256: 4587aebe8b271cff17e5bf668b6027bda501e8d985edd15f208cb71135d618d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=download+texture+pack+realistic PDF link annotation
    • http://codienlanhminhquang.com/upload/files/mases.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/zusopa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d7a14d710---83597874796.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c25398b3---vuvoraxiwowoluduzasezekav.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51a25c6b4---37407446269.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/37048036922.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/c8givv1npq1pe1m0c12smec722/fedufatijipule.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/60202356113.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/39065307058.pdfIn PDF document text
    • http://belst.by/upload/file/80668861354.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/majegudomudikisajoxedim.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/popavefo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/8317385231.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868822a07c7---vitegi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/zexosonuxabunerab.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/88579264013.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55f909a69---rimexarinazoka.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c588bcc7370---63621905879.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xukirawajap.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/kumosap.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a640675b2---75423102092.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d86d5bf27---26871016459.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tk5nn5uh5942glar8a3t1rq7tf/poweme.pdfIn PDF document text
    • https://campermagazine.tv/public/file/15400126989.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 10888 bytes
SHA-256: 3701a903c92c3ef627bc2fc00dba0bd7bf82eb1eaaa1f111e5739d9b0eda0b39
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 19108 bytes
SHA-256: f6bfc5b5f293008700028944fa00489607496d59f56606cc58fa334893bff0ea

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